推移质运动的二维数学模型

本文建立了一个模拟推移质运动的二维数学模型，水流运动方程中考虑了河流弯曲处环流所引起的动量交换，推移质运动方程中则考虑了推移质运动的随机性、床沙粗细颗粒的相互影响及床沙级配沿河宽的调整。利用连续弯道清水冲刷河床变形试验资料对模型进行了检验，检验结果表明，数值计算结果在定床及动床水面线、流速沿河宽分布、冲刷过程中水位下降过程、河床的平面变形、出口断面推移质输沙率及其级配、床沙沿纵横向的分选等方面与试验结果吻合较好。

A 2-D Mathematical Model of Bedload Movement

A 2-D mathematical model of bedload movement for bends was estabilished in this paper. Water momentum exchanges at the bend was considered in the water movement equation. The probability of bdload movement and the hiding protruding action of nonuniform sediment partical were consideded in the bedload movement equation.The model was tested by the data of riverbed deformation of bends by clear water. The calculated results show that the water level of the fixed bed and the movable bed, the velocity distribution along the cross section, the water level process during degradation, the riverbed deformation of bends, the bedload transport rate and the bedload size distribution at the output section and the sorting of the She distribution of the bed material were in close agreement with the experimental measured results.